Wideband phase locked loop signal conditioner for radio...

Details Wideband phase locked loop signal conditioner for radio... Wideband phase locked loop signal conditioner for radio...

H - Electricity

03

J

331/33, 343/43

H03J 7/12 (2006.01) G01S 13/32 (2006.01)

Patent

CA 1201517

WIDEBAND PHASE LOCKED LOOP SIGNAL CONDITIONER FOR RADIO ALTIMETER Abstract of the Disclosure A wideband phase locked loop oscillator (PLLO) for tracking the frequency of an altitude signal in an FM/CW type radio altim- eter. The phase locked loop oscillator conventionally includes a voltage controlled oscillator (VCO), a phase comparator for compar- ing the phase of the altitude signal to be tracked with the phase of the VCO output and an error signal amplifier for applying the output of the phase comparator as control voltage to the VCO. The frequency range of the PLLO is extended by changing the natural frequency of the VCO in steps spanning the useful frequency range of the altitude signal. Selection of the proper value of VCO natural frequency is effected through microprocessor directed digi- tal control.

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